Why do I post this? It is because I bought this phone for my wife and I am the service guy for the phone. Settings and apps, I will have to answer her questions and requests.

Warning: Service your Samsung Galaxy W at your own risk. Do not try it unless you know what is the risk. The best method to fix your SGW is to service it at Samsung authorized service center.

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source: the manual is posted by XDA member at:
http://forum.xda-developers.com/showthread.php?t=1472623